They have common factors of 1 and 2
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1 is a factor of every nonzero number, so 42 would have it in common with any other number.
43 is a prime number so the common factors of 43 and 42 are 1
The least common multiple of 8 and 42 is one.
Any multiple of 378.
6 * 8 = 48 6 * 7 = 42 The highest common factor is 8.